Process of producing a caoutchouc-like substance.



No Drawing.

UNIT D Y. STATES PATENT orrron.

rzerrz HOFMANN AND xonann nnnnnficx, OFYELBERFELD, GERMANY, nssrenons 'ro FABBENFABRIKEN vonm. FRIEDR. BAYER a 00., on ELIBEBIFELD, GERMANY, n

conronA'rIoN or GERMANY.

PROCESS OF PRODUCING- A GAOUTCHOUG-LICKE SUBSTAN CE.

Specification of Letters Patent.

Application filed ApriLlS, 1912. Serial No. 691,180.

Patented July29, 1913.

To all whom z'tmay concern:

Be it known that we, Fnrrz HOFMANN and KONRAD DELBRficK, doctors. of philosophy,

chemists, citizens of the German Empire, re-

siding at Elberfeld, Germany, have'invented new and useful Improvements in Processes of Producing a Caoutchouc-Like Substance, of which the following is a specification.

When beta-gamma-dimethyl-erythreneis allowed to stand for several months it is converted .into a solid product of autopolymerizaticn differentin its properties from the product obtained by polymerizing this same hydrocarbon by'heating. (Kondakow,

109.) -We have now foundthat the autopolymerization of beta gamma dimethyl erythrene" can be materially promoted by carrying it out with the addition of. the

above referred to autopolymerization prod not. The product obtained'can be used as a substitute for caoutchouc or gutta percha, by treating it with basic substances.

In order to illustrate the new process more fully the following example is given,

the parts being by weight :100 parts of the white product of autopolymerization above referred to obtained from betagamma-dimethylerythrene are put together with 300 parts of freshly prepared beta set our hands in the presence of two sub scribing witnesses. I

FRITZ HGFMANN [1 s.] KONRAD DELBRUCK. [1,. s.] V Witnesses:

HELEN NUrER, ALBERT Norm. 

